Stopping mechanism.



T. G. PLANT. STGPPING MEGHANISM. APPLIGATION FILED DB0` 2, 1907. RBNBWBD APR. 14, 1909.

94:0;052. Patented Nov. 16, 1909,

3 UNITED srATns frarniwr yclarion. Y

THOMAS e. PLANT, orzeos'roN, Massaonusmr.

STOPPING MECHANISM.

Patented Nbv. 16,1909.

Application .mea December 2, 1907, serial No. 404,??95. Renewed april 14, 196e. seriaino. retraso.`

To allwhom it may concern:

Be it known that I, THoMAs G. PntN'r, a' citizen .of the United States, ,residing at Boston, in the county of Suffolk and State of Massachusetts, have invented an Improvement in Stopping Mechanisms, o which the following description, in connection with the accompanying drawin s, is a speciiication,

.like numerals on the rawings representing like parts v In many classes of machines, such, for exam le, as rapid-running.sewing-machines, it

is eslrable, when the machine is stopped, that the parts be brought to rest in a predetermined position, but under high speedthe momentum of the parts is` considerable, and the diiliculty of bringing` the machine to rest at a predetermined point Without breakage is proportionately eat. Attempts have been made to provi stopping mechanism thatwould secure the desired object and at the same time avoid shock and .consequent danger of breakage, but in all these prior n eilorts the complicated nature of the mechanism has either given only partial satisfaction or introduced other serious objections,

as well understood by those skilled in the art. The object of the present invention is to provide simple, compact and effective means or stopping 'the machine at a predetermined pointw1th the'minimum amount of shock or breaka e of parts.

Other o jects will appear from the following description of vone form or embodiment of the invention selected for illustrative purposes,

In the draWing:-Figure 1 is an end view of a stopping mechanism embodyingl the present invention, parts being in section and others broken away to better illustrate the g operativevrelation of the elements; Fig. 2 is `"arsectional view of Fig. 1, on line 2 2, and

Fig. 3 is a fragmentary detail showing the relation of the stop arm and the cam faces of the 'fast and loose stop members to be hereinafter described.

The sto mechanism herein is illustratedl 'as applie tothe arm A of'a machine for sewing shoes or thelike, said arm carrying the driving shaft 1, having loosely mounted thereon by appro riate means, as the sleeve A 2v and cap 3, a be t pulley 4 constituting thel -loose member of a clutch. Secured to the shaft 1 b suitable means, as the spline Aor ,5i-key@ is. le fast clutch member the pulley' and clutch member having interposed between theiry adjacent aces'a friction material 5, and constituting one forni-,of clutch for connecting the shaftfl to d disconnecting it from the belt. or drivinggipulley 4, throu h the sliding wedge bloclrQ-S controlle by a treadle rodl 9, asvvilll be fully understood by those skilled in the artwithout further etailed description.

Seatedwithin the recessed face 10 of the clutch member 7 is a spring "11, one end of which is secured at 12 to the clutch member 7, andthe opposite end of which is secured tothe initial vstopping arm 13 at 14, The"\arm 13, which ,for identification is termed the initial stopping arm, consists of a recessed hub portion 15A (Fig. 2) fitted loosely upon the hubl portion 16 ofl the clutch member 7 and having stop member 17 rojecting laterally beyond the face plane o the Vclutch member 7, as indicated in Fio.- 2.

The ,face 18 of the clutch member 7 vis provided vwith a cam 19, extending partially around, the circumference of the clutch-mcmi-;

ber and terminating in a reverse stop y20 for a .urpose that will presently appear.

{ountedto'slide lengthwise of the stud 21 is a sleeve ,22, carrying a stop nger 23 and a. brake arm 24mprov1devd with an adjustable brake shoe 25.

As one means forv moving the sleeve 22 lengthwise upon the stud 21, there is provided a stud 26 projecting from the sleeve and engaging the end 27 of a-bell-crank lever, pivoted at 29, and operatively joined to a treadle (not shown) by,l a rod 30, a spring 3l connected to the bell-orank-leyer 28 and a part of the frame tendingto nor mally move the sleeve 22 to the left, Fig. 2, L

to present the stop finger 23 to the stop member 17 of the initial stop 13 and the stop `20 of' the clutch member 7, as will be readily understood by those skilled in the art.

Projectin from the sleeve 22 is a lug 32, positioned or contact with a pin 33 snpported by a spring 34 seated upon the ixed bracket 35. From the construction described, it will be understood that upon starting the machine, the treadle controllino'y sleeve 22 will be manipulatedfto move the sleeve 22 andthe stop 23, Fig. 2, outof the path .,of, movement of the initial stoppin arm 13, andthe stop 20on the, clntch mem er, and clutclismen,iberl 7 will'be moved loyEltheY wedge block 8, or other suitable means, to bring the clutch member into driving engagement with the driving pulley 4. When the ma` chine isto be stopped, the Wedge block 8 is raised' to remove the driving pressure between theclutch member 7 and pulley t', and at the-same time the sleeve-22 is freed to the actionof its spring 31 and moves to the left, Fig. 2, in which position its stop finger 23 rests against the face cam 19 until it 1s met Iby. the projecting stop member 17. The face 37 of the stop member 17 is beveled as shown, Fig. 3, so that when it enga-ges the stop linger 2,3,- the latter is moved tarther to the left, securely locking the initial stopping arm 13 from further rotation. The clutch member7 continues to rotate in the direction of the arrow, Fig. 1, under the momentum of the machine movements, thus winding up the spring 11: u'ntil such momentum is overcome,l whereupon the clutch member 7, with its connected machine parts, is given a reverse movement under -the stress of the spring 11, and is brought to rest against the stop linger 23. y -I XVhen the stop member 17 engages the stop iinger 23, it tends to turn the sleeve i212 t e brake shoe against the periphery o the clutch member 7 and-operating to overcome the momentum of the machine. vWhen the `stop 20 on the reverse movement of the clutch member 7 engages the opposite side j l of the stop finger 23, it likewise acts to -turn the sleeve 22011 its stud but in the op osite direction, the lug 32 at such time eing broughtinto contact Vwith the'spring pin 33,

thus cushionin .the reverse stoppin movement. A hand e 36 may be provide to operate the -bell crank'lever 28 and permitthe machine to be turned b hand when deisired', and various mo ifications can be made in the particulars illustrated, within the scope of the present invention.` For instance, theparticular form or character of clutch for connecting the machine to its driving power is not essential, and, indeed,

the device may be reformed in many details suggestive to themind of the ordinary mechanic.

`iVhat is claimed and desired to be secured by Letters Patent, is

1. A stopping mechanism, comprising in combination, a driving shaft,ifast and loose clutch members associated therewith, said -fast clutch member having a reverse. stop to bring the vmechanism to rest upon reverse movement of` said shaft, an initial stopping arm mounted for rotative movement with rcspect to said shaft, a spring having one end connected to the initial stopping arm and the other end connected toLthe fast clutch member, a stop `finger, and means for moving said stop linger into and out of the pathvtial stopping arm and the other end connected to the fast clutch member, a stop finger, means for moving said stop finger into and out of thevpath o movement of the initial stopping arm and reverse stop, and yielding means acting through the stop finger to cushion the stopping action of the reverse stop. l i

3. A vstopping mechanism, comprising in combination, adriving shaft, fast and loosey clutch members associated therewith, the lfast clutch member having a face cam and reverse stop to bring the mechanism to rest upon reverse movement of said shaft, an initial stopping arm having a projecting stop member, a spring having one end connectedv to the initial stopping arm and the other end connected to the fast clutch member, a stop finger, and means for forcing the stop linger toward the said xed clutch member to engage the stop finger with Athe said face cam in the path of movement'of the projecting stop member, and thereafter place said stop finger in the path of the reverse stop.

. 4. A stopping mechanism, comprisingin combination, af driving shaft, fast and loose clutch members associated therewith, the

fast clutch member having a face-cam and reverse stop, an initial stopping arm having a' projecting stop member,a spring having -one end connected to the initial stopping larmand the other end connected to-the fast clutchmernber, a stop finger, means for forcing the stop finger towardv the .said fixed clutchmember to engage the stop finger With the said face cam in. the path of movement oi. the projecting stop member and thereafter place said stop finger in the path of the reverse stop, and a brake movable with `said stop finger.

5. In a stop in mechanism, the combination of a shafit), ist and loose clutch members. associated therewith, thel fast clutch member having aface cam and reverse stop, an initial stopping arm having a projecting stop member, a s ring connectmg the initial stopping arm an fast clutch member, a stop finger, and means acting normally tov move Athe stop finger into engagement With'said face cam' and into the path of movement of the projecting stop member to bring the initial stopping arm to rest, and then into the path of the reverse stop.

6. In a stop ing mechanism, the combination of a shari?, fast and loose clutch mem- 

